Public bug reported:
The Lenovo 100e Chromebook Gen 2 (codename: Vilboz) has non-functional
audio on Ubuntu 24.04. All audio drivers load correctly and the hardware
is detected, but PipeWire cannot use the audio device due to missing UCM
(Use Case Manager) configuration.
Hardware Details:
- Model: Lenovo 100e Chromebook Gen 2
- DMI Product Name: Vilboz
- DMI Product Family: Google_Zork
- Audio Hardware: acp3xalc56821015 (AMD ACP3x + Realtek RT5682 + RT1015)
- Audio Card: Google-Vilboz-rev4
Current Status:
- All audio drivers are loaded (snd_acp3x_i2s, snd_soc_rt5682, snd_soc_rt1015)
- Hardware is detected correctly in /proc/asound/cards
- ALSA can access the device when PipeWire is stopped
- Mixer controls show speakers are enabled
- However, PipeWire shows only "Dummy Output" and cannot use the real hardware
Root Cause:
The UCM configuration file
/usr/share/alsa/ucm2/AMD/acp3xalc56821015/acp3xalc56821015.conf only recognizes
these Google_Zork models:
- Berknip, Dirinboz, Gumboz, Jelboz, Trembyle, Woomax (1-mic variants)
- Dalboz, Ezkinil, Jelboz360, Morphius (2-mic variants)
- Shuboz (with specific SKU checks)
"Vilboz" is NOT in this list, so the UCM configuration never loads.
Proposed Fix:
Add "Vilboz" to the regex match in the UCM config file. Based on the hardware
configuration, Vilboz appears to be a 2-mic variant like Dalboz/Morphius.
In /usr/share/alsa/ucm2/AMD/acp3xalc56821015/acp3xalc56821015.conf, change line
23 from:
```
Regex "^(Dalboz|Ezkinil|Jelboz360|Morphius)$"
```
To:
```
Regex "^(Dalboz|Ezkinil|Jelboz360|Morphius|Vilboz)$"
```
System Information:
- Ubuntu 24.04.3 LTS (Noble)
- Kernel: 6.14.0-33-generic
- alsa-ucm-conf version: (check with: dpkg -l | grep alsa-ucm-conf)
- PipeWire version: (check with: pipewire --version)
Testing:
With PipeWire stopped, direct ALSA playback works without errors:
```
systemctl --user stop pipewire pipewire-pulse wireplumber
speaker-test -D hw:1,0 -t wav -c 2 -l 1
```
This confirms the hardware path is functional.
Additional Information:
See attached audio-bug-report.txt for complete hardware details and mixer state.
** Affects: alsa-ucm-conf (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2129824
Title:
Missing UCM support for Lenovo 100e Chromebook Gen 2 (Vilboz) - No
audio output
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